Pictures of students drinking posted on Facebook prompted Towson University to place five sororities on probation, school officials said Monday.

The university sanctioned eight sororities and forbade five of them ? Alpha Omicron Pi, Alpha Phi, Phi Mu, Phi Sigma Sigma and Zeta Tau Alpha ? from holding parties, formals or other social events until spring break as punishment for drinking before and during last month?s Bid Day, when Greeks recruit new members and tackle them.